Science Service System

Summary of Proposal HYD1474

TitleUsing Archived TerraSAR-X for Studying Fast Ice Flow
Investigator Joughin, Ian - University of Washington, Polar Science Center
Team Member
Dr Smith, Ben - Polar Science Center, Applied Physics Lab, University of Washington, APL/Polar Science Center
SummaryRecent changes, including the dramatic speedups (50 to 100%)of several large outlet glaciers, and increased rates of surface melting, have increased Greenlandís contribution to sea-level rise from near zero in the1990s to a current imbalance of roughly 100 to 225 Gtons/yr [e.g. Luthcke etal., 2006; Rignot and Kanagaratnam, 2006]. Similar speedups have occurred in the Antarctica Peninsula and along the Amundsen Coast region of West Antarctica. The reasons for these speedups and their connection to climate are poorly understood [Moon et al, 2012]. This poor knowledge of the processes that influence outlet glaciers is one of the limitations on prediction of future ice sheet contributions tosea level rise that was noted by the Intergovernmental Panel on Climate Change (IPCC)[IPCC,2007]. The international constellation of SAR and optical satellites has provided important observations of rapidly changing outlet glaciers in Greenland and Antarctica. In recent years, TSX has provided some of the best observations. With its fine-resolution and other capabilities, TSX is ideally suited to measuring change on these fast moving glaciers, many of which are only a few kilometers wide. We have already processed an extensive set of imagery through earlier calls. Through this proposal we will augment our earlier results using additional archived TSX data.These data will be processed to yield time-series of glacier velocity. These TSX images and the resulting velocity products represent a major TSX contribution to the polar ice-sheet community.

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